منابع مشابه
Extremely Red Radio Galaxies
At least half the radio galaxies at z > 1 in the 7C Redshift Survey have extremely red colours (R−K > 5), consistent with stellar populations which formed at high redshift (z ∼ 5). We discuss the implications of this for the evolution of massive galaxies in general and for the fraction of near-IR-selected EROs which host AGN, a result which is now being tested by deep, hard X-ray surveys. The c...
متن کاملExtremely Red and Dusty Galaxies
Preliminary results of a project aiming at unveiling the nature of the extremely red galaxies (ERGs) 1 found in deep optical-NIR surveys are presented. Very little is known about these objects, the critical issue being whether they are old ellipticals at z>1 or distant star-forming galaxies strongly reddened by dust extinction. We expect to shed light onto the unknown nature of these galaxies b...
متن کاملExtremely red galaxies: dust attenuation and classification
We re-address the classification criterion for extremely red galaxies (ERGs) of Pozzetti & Mannucci (2000 – PM00), which aims to separate, in the Ic − K (or Rc − K) vs. J−K colour–colour diagram, passively evolving, old (> 1 Gyr) stellar populations in a dust-free environment, associated with ellipticals (Es), from dusty starburst galaxies (DSGs), both at 1 < z < 2. We explore a category of obj...
متن کاملExtremely Red Galaxies in the Phoenix Deep Survey
The Phoenix Deep Survey (PDS) is a multiwavelength survey based on deep 1.4 GHz radio observations used to identify a large sample of star forming galaxies to z = 1. Here we present an exploration of the evolutionary constraints on the star-forming population imposed by the 1.4 GHz source counts, followed by an analysis of the average properties of extremely red galaxies in the PDS, by using th...
متن کاملNew clues on the nature of extremely red galaxies ?
We present near-infrared VLT-UT1+ISAAC spec-troscopy of a sample of 9 extremely red galaxies (ERGs) with R − K > 5 and K < 19.0. Neither strong emission lines (F lim <1–5×10 −16 erg s −1 cm −2) nor continuum breaks are detected. From near-infrared spectrophotometry, complemented with broad-band optical and near-IR photometry, we estimate " spectro-photometric " redshifts to be in the range of 0...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2006
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921306006107